Preparation method of porous medium solar heat absorber with gradually changing structure
A technology for solar heat absorbers and porous media, which is applied to parts of solar heat collectors, solar heat collectors, solar thermal energy, etc., can solve the lack of experimental proof of effectiveness and the lack of preparation of new porous media solar heat absorbers Methods and other issues to achieve the effect of gradual change of structural parameters, reduction of temperature gradient, and enhancement of convective heat transfer
Active Publication Date: 2019-04-30
XI AN JIAOTONG UNIV
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Problems solved by technology
From the perspective of research methods, although numerical simulation can guide the design of heat sink structure, its effectiveness is still lacking in experimental proof.
At the same time, in the current experimental research, simple heat absorber structures can only be obtained by stacking different uniform porous media, and there is still a lack of preparation methods for new porous media solar heat absorbers.
Method used
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[0021] Below in conjunction with the accompanying drawings, the present invention will be described in detail by taking the processing of a porous medium solar heat absorber whose porosity linearly changes from 0.85 to 0.65 along the thickness direction as an example:
[0022] First, the inter-network membrane and surface modification were removed from the polyurethane organic foam precursor with a cell density of 10PPI and a thickness of 4cm.
[0023] Secondly, a ceramic slurry with a higher viscosity is configured. Mix 47.4g of silicon carbide powder and 18.2g of white corundum powder to form the main ceramic powder, add 1.4g of kaolin and 0.7g of bentonite as sintering aids, and mix well. Add 17.2 g of alkaline silica sol and 3.4 g of 4 wt % carboxymethyl cellulose, and add 0.8 g of deionized water to adjust the solid phase mass fraction to 76%. Subsequently, the slurry was placed in a ball mill at a speed of 200 rpm, and ball milled for 3 hours.
[0024] In the first slu...
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Abstract
The invention discloses a preparation method of a porous medium solar heat absorber with gradually changing structure. The organic template impregnation method is used, and a technological process oflayering and multiple slurry hanging is put forward. The viscosity of the slurry is controlled by adjusting the solid mass proportion, the high-viscosity slurry is used for initial slurry hanging, andthe whole porous material is hung with the slurry. Low-viscosity slurry is used for subsequent slurry hanging, the range of a porous area of slurry hanging is adjusted gradually, and the porous medium heat absorber with gradually changing structure in the thickness direction is obtained. The preparation method provided by the invention can control the structural parameters such as porosity and aperture in the thickness direction of the porous medium, and realizes the preparation of the porous medium solar heat absorber with gradually changing structure.
Description
technical field [0001] The invention belongs to the technical field of solar heat utilization, and in particular relates to a preparation method of a porous medium solar heat absorber with gradually changing structure. Background technique [0002] As a key component in the concentrated solar thermal power generation system, the heat absorber undertakes the task of transferring solar radiation energy to the heat exchange fluid. Due to the concentrated heat flow and high surface temperature of the traditional surface absorption heat sink, it will cause high heat radiation loss. The porous medium solar heat absorber is a volumetric heat absorber, and the solar radiation can gradually attenuate in the porous medium, reducing the concentrated heat flow on the surface; at the same time, its complex three-dimensional network structure and huge heat exchange area can significantly enhance The convective heat transfer between the heat exchange fluid and the heat absorber forms a "b...
Claims
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IPC IPC(8): C04B35/565C04B35/622C04B38/06F24S70/16
CPCC04B35/565C04B35/622C04B38/0615C04B2235/3217C04B2235/3418C04B2235/349C04B2235/6562C04B2235/6567C04B38/0074
Inventor 李明佳杜燊何雅玲陶文铨
Owner XI AN JIAOTONG UNIV